Scroll compression device and assembling method for scroll compression device

ABSTRACT

There are provided a scroll compression device in which magnetization of a rotor and centering of a fixed scroll can be easily performed, and a method of assembling the scroll compression device. In a method of assembling a scroll compression device  1  comprising a scroll compression mechanism  11  having a fixed scroll  23  and a swing scroll  25  and a driving motor  13  that is connected to the scroll compression mechanism  11  through a driving shaft  15  to drive the scroll compression mechanism  11,  the scroll compression mechanism and the DC motor being accommodated in a casing, the scroll compression mechanism  11  is supported in the casing  3  by a main frame  21,  a rotor  39  of the driving motor  13  is magnetized, compressed gas which prevails against magnetic force caused by the magnetization and makes the swing scroll swingable is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion and the swing scroll and the fixed scroll are centered after the rotor  39  is magnetized, and then the fixed scroll is positioned to the main frame.

TECHNICAL FIELD

The present invention relates to a scroll compression device that perform compression through the engagement between a fixed scroll and a swing scroll, and an assembling method for a scroll compression device.

BACKGROUND ART

There has been hitherto known a scroll compression device that has a compression mechanism comprising a fixed scroll and a swing scroll having mutually engageable spiral laps in a hermetically sealed casing and in which the compression mechanism is driven by a driving motor so that the swing scroll makes a circular motion with respect to the fixed scroll without rotating on its own axis, thereby performing compression. In this scroll compression device, the assembling precision under the state that the fixed scroll and the swing scroll are engaged with each other has a great affect on compression performance and durability. Therefore, there is known a method of centering the fixed scroll while the swing scroll is made to make a swing motion with respect to the fixed scroll so that the clearance between laps of the fixed scroll and the swing scroll is reduced and made uniform (see Patent Document 1, for example).

PRIOR ART DOCUMENT Patent Document

Patent Document 1: JP-A-2005-188519

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

A rotor of a driving motor is magnetized bypassing current through stator windings of a stator, or magnetized by external magnetization using an external magnetizing device. When the fixed scroll is centered, compressed gas is injected from the discharge side of a compression mechanism, and the swing scroll is made to make a swing motion by the pressure of the compressed gas. However, when the rotor is magnetized, the swing scroll cannot easily make a swing motion due to the magnetic force, and thus there is a problem that the working efficiency of centering the fixed scroll is lowered.

The present invention has an object to solve the problem of the prior art described above and provide a scroll compression device in which magnetization of a rotor and centering of a fixed scroll can be easily performed, and an assembling method for the scroll compression device.

Means of solving the Problem

In order to attain the above object, according to the present invention, a method of assembling a scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, is characterized by comprising: supporting the scroll compression mechanism in the casing by a main frame; magnetizing a rotor of the DC motor; making compressed gas act on a discharge side of the scroll compression mechanism so that the swing scroll is made swingable while prevailing against magnetic force caused by the magnetization after the rotor is magnetized, whereby the swing scroll makes a swing motion and the swing scroll and the fixed scroll are centered; and then positioning the fixed scroll to the main frame.

According to the present invention, the compressed gas which prevails against the magnetic force caused by the magnetization and makes the swing scroll swingable can be made to act on the discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion and the fixed scroll is centered, and the fixed scroll can be positioned to the main frame. Therefore, even when the rotor is magnetized, the swing scroll can be made to make a swing motion by the pressure of the compressed gas and the fixed scroll and the swing scroll can be assembled with each other as in the case where the rotor is not magnetized.

In this construction, the rotor may be magnetized by repeating an operation of rotating the driving shaft by a predetermined angle, stopping the driving shaft, applying a voltage to stator windings of the DC motor, rotating the driving shaft by a predetermined angle again, stopping the driving shaft again and then applying the voltage again. Furthermore, the rotor may be magnetized before assembled to the DC motor.

Furthermore, in order to attain the above object, according to the present invention, a method of assembling a scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, is characterized by comprising: supporting the scroll compression mechanism in the casing by a main frame; positioning the fixed scroll to the main frame after compressed gas is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion to center the swing scroll and the fixed scroll; and repeating an operation of rotating the driving shaft by a predetermined angle, stopping the driving shaft, applying a voltage to windings of the DC motor, rotating the driving shaft by a predetermined angle again, stopping the driving shaft again and then applying the voltage again to magnetize the rotor.

According to the present invention, the rotor can be magnetized after the compressed gas is made to act on the discharge side of the scroll compression mechanism to make the swing scroll swing and center the fixed scroll and the fixed scroll is positioned to the main frame. Therefore, when the fixed scroll is centered, the swing scroll can make a swing motion without being affected by the magnetic force of the rotor, and the swing scroll can be made to swing by the pressure of the compressed gas and the fixed scroll can be centered.

Furthermore, in order to attain the above object, according to the present invention, a scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, is characterized in that the scroll compression mechanism is supported in the casing by a main frame; a rotor of the DC motor is magnetized; after the rotor is magnetized, compressed gas which prevails against magnetic force caused by the magnetization and makes the swing scroll swingable is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion and the swing scroll and the fixed scroll are centered; and then the fixed scroll is positioned to the main frame, whereby the scroll compression mechanism is assembled.

Still furthermore, in order to attain the above object, according to the present invention, a scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, characterized in that the scroll compression mechanism is supported in the casing by a main frame; the fixed scroll is positioned to the main frame after compressed gas is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion to center the swing scroll and the fixed scroll; and then an operation of rotating the driving shaft by a predetermined angle, stopping the driving shaft, applying a voltage to windings of the DC motor, rotating the driving shaft by a predetermined angle again, stopping the driving shaft again and then applying the voltage again is repeated to magnetize the rotor, whereby the scroll compression device is assembled.

Effect of the Invention

According to the present invention, even when the rotor is magnetized, the compressed gas which prevails against the magnetic force caused by the magnetization and makes the swing scroll swingable can be made to act on the discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion and the fixed scroll is centered, and the fixed scroll can be positioned to the main frame. Therefore, even when the rotor is magnetized, the swing scroll can be made to make a swing motion by the pressure of the compressed gas and the swing scroll can be centered as in the case where the rotor is not magnetized. Accordingly, the magnetization of the rotor and the centering of the fixed scroll can be performed irrespective of the order of the magnetization of the rotor and the centering of the fixed scroll.

BRIEF DESCRIPTION OF THE INVENTION

FIG. 1 is a cross-sectional view showing a scroll compression device according to an embodiment to which the present invention is applied.

FIG. 2 is a cross-sectional view of the scroll compression device which shows a state that a fixed scroll is centered.

MODES FOR CARRYING OUT THE INVENTION First Embodiment

A first embodiment according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 represents a scroll compression device whose internal pressure is high. The compression device 1 is connected to a refrigerant circuit (not shown) in which refrigerant is circulated to perform a refrigeration cycle operation, and compresses the refrigerant. The compressor 1 has a hermetically-sealed doom type casing 3 having a vertically elongated cylindrical shape.

The casing 3 is configured as a pressure container comprising a casing main body 5 as a cylindrical barrel portion having an axial line extending in the up-and-down direction, a cup-shaped upper cap 7 which is air-tightly welded and integrally joined to the upper end portion of the casing main body 5 and has a convex surface protruding upwards, and a cup-shaped lower cap 9 which is air-tightly welded and integrally joined to the lower end portion of the casing main body 5 and has a convex surface protruding downwards. The inside of the casing 3 is hollow. A terminal cover 52 is provided to the outer peripheral surface of the casing 3, and a power supply terminal 53 for supplying power to a stator 37 described later is provided in the terminal cover 52.

In the casing 3 are accommodated a scroll compression mechanism 11 for compressing refrigerant and a driving motor 13 disposed below the scroll compression mechanism 11. The scroll compression mechanism 11 and the driving motor 13 are connected to each other through a driving shaft 15 which is disposed so as to extend in the up-and-down direction in the casing 3. A gap space 17 is formed between the scroll compression mechanism 11 and the driving motor 13.

A main frame 21 is accommodated at the inner upper portion of the casing 3, and a radial bearing portion 28 and a boss mount portion 26 are formed at the center of the main frame 21. The radial bearing portion 28 pivotally supports the tip (upper end) side of the driving shaft 15, and is configured to project downwards from the center of one surface (lower side surface) of the main frame 21. The boss mount portion 26 is used to accommodate therein a boss 25C of a swing scroll 25 described later, and formed by concaving the center of the other surface (upper side surface) of the main frame 21 downwards. An eccentric shaft portion 15A is formed at the tip (upper end) of the driving shaft 15. The eccentric shaft portion 15A is provided so that the center thereof is eccentric from the shaft center of the driving shaft 15, and inserted through a slewing bearing in the boss 25C so as to be turnably driven.

The scroll compression mechanism 11 comprises a fixed scroll 23 and a swing scroll 25. The fixed scroll 23 is disposed in close contact with the upper surface of the main frame 21. The outer peripheral edge of the main frame 21 is secured to the inner surface of the casing main body 5 of the casing 3, and the fixed scroll 23 is fastened and fixed to the main frame 21 by a screw 34. The swing scroll 25 is engaged with the fixed scroll 23, and disposed in a swing space 12 formed between the fixed scroll 23 and the main frame 21. The inside of the casing 3 is partitioned into a high-pressure space 27 below the main frame 21 and a discharge space 29 above the main frame 21. The respective spaces 27 and 29 intercommunicate with each other through vertical grooves 71 which are formed on the outer peripheries of the main frame 21 and the fixed scroll 23 so as to extend vertically.

An intake pipe 31 for introducing the refrigerant in the refrigerant circuit to the scroll compression mechanism 11 air-tightly and fixedly penetrates through the upper cap 7 of the casing 3, and a discharge pipe 33 for discharging the refrigerant in the casing 3 to the outside of the casing 3 air-tightly and fixedly penetrates through the casing main body 5. The intake pipe 31 extends in the up-and-down direction in the discharge space 29, and the inner end portion thereof penetrates through the fixed scroll 23 of the scroll compression mechanism 11 and intercommunicates with the compression chamber 35, whereby the refrigerant is sucked into the compression chamber 35 through the intake pipe 31.

The driving motor (DC driving motor) 13 is a DC (Direct Current) motor which is actuated upon an input from a DC power source, and has an annular stator 37 and a rotor 39 which is freely rotatably provided in the stator 37. The driving motor 13 is operated while the rotation torque thereof is controlled by a PWM (Pulse Width Modulation) inverter which receives a constant input voltage and controls the duty ratio of pulse waves, that is, an output period of the pulse waves and the pulse width of the output pulse waves.

The swing scroll 25 of the scroll compression mechanism 11 is operationally connected to the rotor 39 through the driving shaft 15. The stator 37 comprises a stator core 37A and a stator coil 18. The stator core 37A is formed by laminating thin iron plates and has plural grooves (not shown) therein. The stator coil 18 is formed by winding stator windings of plural phases, and provided to be fitted in the grooves formed in the stator core 37A at the upper and lower sides of the stator core 37A. The stator coil 18 is accommodated in an insulator 19. The stator 18 is connected to the power supply terminal 53 through a conductive wire (not shown).

The rotor 39 is magnetized by ferrite magnet or neodymium magnet. As a method of magnetizing the rotor 39 is known a winding magnetizing method of inserting the rotor 39 in the stator 37 and then passing current through stator windings forming the stator coil 18 of the stator 37 to magnetize the rotor 39, or an externally magnetizing method of magnetizing the rotor 39 by using an external magnetizing device and then inserting the rotor 39 in the stator 37. A holder (pinholder) 58 is press-fitted in the driving shaft 15, and used to position the rotor 39 when the winding magnetization of the rotor 39 is performed.

The stator 37 is supported on the inner wall of the casing 3 by an annular spacer ring 38. The spacer ring 38 is fixed to the inner wall surface of the casing 3 by shrinkage fitting, and the stator 37 is fixed to the inner wall surface of the spacer ring 38 by shrinkage fitting. The upper end surface of the spacer ring 38 is provided at a lower position than the upper end surface of the stator 37.

A bearing plate 8 in which the lower end portion of the driving shaft 15 is rotatably fitted and supported is provided below the driving motor 13. As shown in FIG. 2, the bearing plate 8 has a boss portion 8A into which the cylindrical driving shaft 15 is fitted, and arm portions 8B which are provided at substantially equal intervals on the periphery of the boss portion 8A so as to extend in the four directions and fixed to the casing main body 5. That is, the driving shaft 15 is supported in the casing 3 by the bearing plate 8. The bearing plate 8 have opening portions 8E which are formed among the respective arm portions 8B and through which upper and lower spaces above and below the bearing plate 8 intercommunicate with each other.

As shown in FIG. 1, the lower space (oil pool) 40 below the bearing plate 8 is kept at high pressure, and oil is pooled at the inner bottom portion of the lower cap 9 corresponding to the lower end portion of the lower space 40. An annular plate 59 is provided between the bearing plate 8 and the oil pool 40 so as to be fixed to the bearing plate 8. Furthermore, a baffle plate 14 is provided above the annular plate 59 so as to be supported by the annular plate 59. The baffle plate 14 is formed of thin plate type punching metal having many fine pores, for example.

A oil supply path 41 as a part of high-pressure oil supplying means is formed in the driving shaft 15, and the oil supply path 41 extends vertically in the driving shaft 15 and intercommunicates with an oil chamber 43 at the back side of the swing scroll 25. The oil supply path 41 is connected to an oil pickup 45 provided to the lower end of the driving shaft 15. A lateral hole 57 is provided at the back side of the oil pickup 45 so as to extend in the radial direction of the driving shaft 15 and penetrates through the oil supply path 41. The holder 58 described above is press-fitted into the lateral hole 57. The oil pickup 45 is press-fitted into the driving shaft 15 after the rotor 39 is magnetized.

The oil pickup 45 has a suction port 42 provided to the lower end thereof, and a paddle 44 formed above the suction port 42. The lower end of the oil pickup 45 is immersed in lubrication oil pooled in the oil pool 40, and the suction port 42 of the oil supply path 41 is opened in the lubrication oil. When the driving shaft 15 rotates, the lubrication oil pooled in the oil pool 40 enters the oil supply path 41 from the suction port 42 of the oil pickup 45, and is pumped up along the paddle 44 of the oil supply path 41. The thus-pumped lubrication oil is passed through the oil supply path 41, and supplied to the respective sliding portions of the scroll compression mechanism 11 such as the radial bearing portion 28, the slewing bearing 24, etc. Furthermore, the lubrication oil is supplied through the oil supply path 41 to the oil chamber 43 at the back side of the swing scroll 25, and supplied from the oil chamber 43 through an intercommunication path 51 provided to the swing scroll 25 to the compression chamber 35.

The main frame 21 penetrates radially from the boss mount portion 26 through the main frame 21 to form a return oil path 47 opened to the vertical groove 71. Excessive lubrication oil out of the lubrication oil supplied through the oil supply path 41 to the respective sliding portions of the scroll compression mechanism 11 and the compression chamber 35 is passed through the return oil path 47 and returned to the oil pool 40. An oil collector 46 is provided below the return oil path 47, and the oil collector 46 extends to the neighborhood of the upper end of the spacer ring 38. Plural notches 54 are formed on the outer peripheral surface of the stator 37 so as to extend between the upper and lower sides of the stator 37. The lubrication oil returned from the oil supply path 41 through the return oil path 47 and the oil collector 46 is passed through the gap between the notches 54 and the gap between the respective arm portions 8B and returned to the oil pool 40. In the cross-sectional view of FIG. 1, the discharge pipe 33 is represented by broken lines for the purpose of simplification of description, but the discharge pipe 33 is disposed to be displaced in phase from the oil collector 46.

The fixed scroll 23 comprises an endplate 23A and a spiral (involute type) lap 23B formed on the lower surface of the end plate 23A. The swing scroll 25 comprises an end plate 25A and a spiral (involute type) lap 23B formed on the upper surface of the end plate 25A. The lap 23B of the fixed scroll 23 and the lap 25B of the swing scroll 25 are engaged with each other, whereby plural compression chambers 35 are formed between the fixed scroll 23 and the swing scroll 25 by both the laps 23B, 25B.

The swing scroll 25 is supported by the fixed scroll 23 through an Oldham's ring 61, and a cylindrical boss 25C having a bottom is provided to the center portion of the lower surface of the end plate 25A so as to protrude from the center portion. Furthermore, the eccentric shaft portion 15A is provided to the upper end of the driving shaft 15, and the eccentric shaft portion 15A is rotatably fitted in the swing scroll 25.

Furthermore, a counter weight portion (upper balancer) 63 is provided to the driving shaft 15 at the lower side of the main frame 21, and a lower balancer 77 is provided to the lower portion of the rotor 39. The driving shaft 15 keeps dynamic balance with the swing scroll 25, the eccentric shaft portion 15A, etc. by the upper balancer 63 and the lower balancer 77.

The driving shaft 15 rotates while keeping weight balance by the counter weight portion 63 and the lower balancer 77, whereby the swing scroll 25 makes an orbital motion. In connection with the orbital motion of the swing scroll 25, the compression chamber 35 is configured to compress refrigerant sucked from the suction pipe 31 in connection with contraction of the volume between both the laps 23B and 25B to the center. A regulation plate which is swaged integrally with the rotor 39 and the lower balancer 77 is provided to the lower surface of the lower balancer 77. The regulation plate 55 is used to regulate the rotation of the rotor 39 when the windings of the rotor 39 are magnetized.

A cup 48 is fixed to the lower side of the main frame 21 by a bolt 49 so as to surround the periphery of the counterweight portion 63. The cup 48 prevents the lubrication oil leaking from the clearance between the main frame 21 and the driving shaft 15 from scattering to the discharge pipe side due to rotation of the counterweight portion 63.

A discharge hole 73 is provided to the center portion of the fixed scroll 23, and gas refrigerant discharging from the discharge hole 73 passes through a discharge valve 75, discharges to the discharge space 29, and then flows out through the vertical grooves 71 provided on the outer peripheries of the main frame 21 and the fixed scroll 23 to the high-pressure space 27 below the main frame 21. This high-pressure refrigerant is discharged to the outside of the casing 3 through the discharge pipe 33 provided to the casing main body 5.

The driving operation of the scroll compression device 1 will be described.

When the driving motor 13 is actuated, the rotor 39 rotates with respect to the stator 37, whereby the driving shaft 15 rotates. When the driving shaft 15 rotates, the swing scroll 25 of the scroll compression mechanism 11 makes only an orbital motion around the fixed scroll 23 without making autorotation. Accordingly, low-pressure refrigerant is passed through the suction pipe 31 and sucked from the peripheral edge side of the compression chamber 35 into the compression chamber 35. This refrigerant is compressed due to the volumetric change of the compression chamber 35, and this compressed refrigerant becomes high-pressure and is discharged from the compression chamber 35 through the discharge valve 75 to the discharge space 29, and then flows out through the vertical grooves 71 provided on the respective outer peripheries of the main frame 21 and the fixed scroll 23 to the high-pressure space 27 below the main frame 21. This high-pressure refrigerant is discharged to the outside of the casing 3 through the discharge pipe 33 provided to the casing main body 5. The refrigerant discharged to the outside of the casing 3 is circulated in the refrigerant circuit (not shown), sucked through the suction pipe 31 into the compressor 1 and compressed again. The circulation of the refrigerant described above is repeated.

The flow of the lubrication oil will be described. The lubrication oil pooled at the inner bottom portion of the lower cap 9 in the casing 3 is sucked up by the oil pickup 45, passed through the oil supply path 41 of the driving shaft 15 and supplied to the respective sliding portions of the scroll compression mechanism 11 and the compression chamber 35. The excessive lubrication oil at the respective sliding portions of the scroll compression mechanism 11 and the compression chamber 35 is collected from the return oil path 47 to the oil collector 46, passed through the notches 54 provided on the outer periphery of the stator 37, and then returned to the lower side of the driving motor 13.

Next, a method of centering the fixed scroll 23 in a process of assembling the scroll compression device will described. In this first embodiment, the rotor 39 is magnetized by winding magnetization, and the centering of the fixed scroll 23 is performed before the rotor 39 is magnetized. That is, when the fixed scroll 23 is centered, the rotor 29 has not yet been magnetized.

The centering of the fixed scroll 23 is performed under the state that the scroll compression mechanism 11 and the driving motor 13 are secured to the casing main body 5, and the upper cap 7, the suction pipe 31, the discharge valve 75 and the lower cap 9 are removed.

An adjustment device 80 is connected to a pipe 82 to a discharge hole 73 provided at the center portion of the fixed scroll 23. The adjustment device 80 comprises a pump 81 for compressing air or gas such as nitrogen or the like, a high-pressure regulator 83, a low-pressure regulator 84, a change-over valve 86, a connection coupler 87, etc.

Under the state that the fixed scroll 23 is temporarily fixed, the casing main body 5 is fixed onto an adjustment table 88. Subsequently, the connection coupler 87 is connected to the discharge hole 73 of the fixed scroll 23, and the pump 81 is actuated. Compressed gas (pressurized fluid) which is adjusted to constant pressure of 5 kg/cm² in the high-pressure regulator 83 is injected from the discharge hole 73 into the swing space 12 through the connection coupler 87 by the change-over valve 86, whereby the compressed gas is made to act on the discharge side of the scroll compression mechanism 11. [0033] The swing scroll 25 makes a swing motion in the opposite direction to that under a normal refrigerant compression operation by the pressure of the compressed gas flowing from the discharge hole 73 into the swing space 12. This swing motion of the swing scroll makes the fixed scroll 23 ensconce itself at a position where the lap 23B of the fixed scroll 23 does come into contact with the lamp 25B of the swing scroll 25 over the whole periphery thereof. Under this state, the fixed scroll 23 is fastened and fixed to the main frame 21 at the optimum position by uniformly tightening a screw 36, whereby the centering of the fixed scroll 23 is performed.

The rotor 39 is magnetized by winding magnetization after the fixed scroll 23 is centered and then fastened and fixed to the main frame 21 at the optimum position. When the rotor 39 is magnetized, the scroll compression device 1 is disposed to be placed upside down before the lower cap 9 and the oil pickup 45 are secured (not shown). Subsequently, the rotating jig is inserted into the oil supply path 41 formed in the driving shaft 15, and the tip of the rotating jig is locked to the holder 58 extending in the radial direction in the oil supply path 41. The driving shaft 15 is rotated by a predetermined angle to dispose the rotor 39 at a predetermined position by rotating the rotating jig under the state that the rotating jig is locked to the holder 58. Under this state, current is passed through stator windings constituting a stator coil 18 of the stator 37 of the driving motor 13 to generate magnetic field inside the stator core 37A, thereby magnetizing the rotor 39. The rotor 39 is magnetized at plural times with being angularly changed while the phase thereof is varied, whereby the rotor 39 is magnetized into plural poles.

According to this magnetization, the centering of the fixed scroll 23 can be performed before the rotor 39 is magnetized. Therefore, when the fixed scroll 23 is centered, the swing scroll 25 makes a swing motion without being influenced by the magnetic force of the rotor 39. Accordingly, the swing scroll 25 is enabled to easily make a swing motion by the pressure of the compressed gas flowing from the discharge hole 73 into the swing space 12. Therefore, the work of centering the fixed scroll 23 can be efficiently performed.

Second Embodiment

In the first embodiment, after the fixed scroll 23 is centered, the magnetization of the rotor 39 is performed by using the winding magnetization. However, in a second embodiment, after the rotor 39 is magnetized by using the winding magnetization, the fixed scroll 23 is centered. The construction of the scroll compression device 1 according to the second embodiment is the same as the scroll compression device 1 according to the first embodiment described with reference to FIG. 1.

In the second embodiment, the magnetization of the rotor 39 is first performed by the winding magnetization. The method of magnetizing the rotor 39 by the winding magnetization is the same as the first embodiment.

In order to magnetize the rotor 39 by the winding magnetization and then center the fixed scroll 23, the casing main body 5 is fixed onto the adjustment table 88 under the state that the fixed scroll 23 is temporarily fixed. Subsequently, the connection coupler 87 is connected to the discharge hole 73 of the fixed scroll 23, and the pump 81 is actuated. High-pressure gas which is adjusted to constant high pressure of 8 to 9 kg/cm² in the high-pressure regulator 83 is injected from the discharge hole 73 into the swing space 12 through the connection coupler 87 by the change-over valve 86, whereby the compressed gas is made to act on the discharge side of the scroll compression mechanism 11.

The swing scroll 25 prevails against the magnetic force of the magnetized rotor 39 by the pressure of the high-pressure gas of 8 to 9 kg/cm₂ injected from the discharge hole 73 into the swing space 12, and makes a swing motion in the opposite direction to that under a normal refrigerant compressing operation. By this swing motion of the swing scroll 25, the fixed scroll 23 ensconces itself at a position where the lap 23B of the fixed scroll 23 does not come into contact with the lap 25B of the swing scroll 25 over the whole periphery thereof. Under this state, the screw(s) 36 is (are) uniformly tightened to fasten and fix the fixed scroll 23 to the main frame 21 at the optimum position.

Under this state, the swing scroll 25 needs strong force for the swing motion due to the influence of the magnetic force of the rotor 39. However, in this construction, the swing scroll 25 can be rotated by the high-pressure gas injected from the discharge hole 73 into the swing space 12 as in the case where the rotor 39 is not magnetized. Accordingly, even in the case where the rotor 39 is magnetized by using the winding magnetization and then the fixed scroll 23 is centered, the fixed scroll and the swing scroll can be assembled with each other with the same level precision as the case where the fixed scroll 23 is centered under the state that the rotor 39 is not magnetized.

Third Embodiment

In the second embodiment described above, the fixed scroll 23 is centered after the rotor 39 is magnetized by using the winding magnetization. However, in a third embodiment, after the rotor 39 is magnetized by using external magnetization, the fixed scroll 23 is centered. The construction of the scroll compression device 1 according to the third embodiment is the same as the scroll compression device 1 of the first embodiment described with reference to FIG. 1.

In the third embodiment, as not shown, after the rotor 39 is magnetized by the external magnetization, the driving motor 13 is secured to the inside of the casing main body 5 under the state that the rotor 39 is fixed to the driving shaft 15 by shrinkage fitting or the like. For example, when it is required to increase the elimination capacity of the scroll compression mechanism 1 and the rotational output of the driving motor 13, the stator 3 is larger. When the stator 37 is larger, it is necessary to magnetize the rotor 39 by the external magnetization. Therefore, the swing motion of the swing scroll 25 is affected by the magnetic force of the rotor 39. The third embodiment provides a method of assembling the fixed scroll and the swing scroll with the same level precision as the case where the fixed scroll 23 is centered under the state that the rotor 39 is not magnetized even when the rotor 39 is magnetized by the external magnetization as described above.

After the rotor 39 is magnetized by the external magnetization, the driving motor 13 is secured to the casing main body 5. Thereafter, the casing main body 5 is fixed onto the adjustment table 88 under the state that the fixed scroll 23 is temporarily fixed. Subsequently, the connection coupler 87 is connected to the discharge hole 73 of the fixed scroll 23, and the pump 81 is actuated. High-pressure gas which is adjusted to constant high pressure of 8 to 9 kg/cm² is injected from the discharge hole 73 into the swing space 12 through the connection coupler 87 by the change-over valve 86, whereby the compressed gas is made to act on the discharge side of the scroll compression mechanism 11.

The swing scroll 25 prevails against the magnetic force of the magnetized rotor 39 by the pressure of the high-pressure gas of 8 to 9 kg/cm₂ which is injected from the discharge hole 73 into the swing space 12, and makes a swing motion in the opposite direction to that under the normal refrigerant compressing operation. The swing motion of the swing scroll 25 makes the fixed scroll 23 ensconce itself at a position where the fixed scroll 23 does not come into contact with the lap 25B of the swing scroll 25 over the whole periphery thereof. Under this state, the screw 36 is uniformly tightened to fasten and fix the fixed scroll 23 to the main frame 21 at the optimum position.

According to this construction, even when the swing scroll 25 falls into a state where the swing scroll 25 cannot easily make a swing motion by the magnetic force of the rotor 39, the swing scroll 25 can make a swing operation by the high-pressure gas injected from the discharge hole 73 into the swing space 12 as in the case where the rotor 39 is not magnetized. Accordingly, even when the driving motor 13 is secured in the casing main body after the rotor 39 is magnetized by the external magnetization and then the fixed scroll 23 is centered, the fixed scroll and the swing scroll can be assembled with the same level precision as the case where the fixed scroll 23 is centered under the state that the rotor 39 is not magnetized.

As described above, according to the embodiment to which the present invention is applied, in the method of assembling the scroll compression device 1 having the scroll compression mechanism 11 comprising the fixed scroll 23 and the swing scroll 25 to compress refrigerant, and the inverter-controlled DC driving motor 13 which is connected to the scroll compression mechanism 11 through the driving shaft 15 to drive the scroll compression mechanism 11, the scroll compression mechanism 11 and the DC driving motor 13 being accommodated in the casing 3, the scroll compression mechanism 11 is supported in the casing 3 by the main frame 21, the rotor 39 of the DC driving motor 13 is magnetized, the compressed gas which enables the swing scroll 25 to be swingable while prevailing against the magnetic force caused by the magnetization after the rotor 39 is magnetized is made to be flow from the discharge hole 73 into the swing space 12 and act on the discharge side of the scroll compression mechanism 11 so that the swing scroll 25 makes a swing motion to center the swing scroll 25 and the fixed scroll 23, and then the fixed scroll 23 is positioned to the main frame 21. Accordingly, the compressed gas which prevails against the magnetic force of the magnetized rotor 39 to make the swing scroll 25 swingable can be injected from the discharge hole 73 into the swing space 12 and made to act on the discharge side of the scroll compression mechanism 11 so that the swing scroll 25 makes a swing motion, the fixed scroll 23 can be centered, and then the fixed scroll 23 can be positioned to the main frame 21. Therefore, even when the rotor 39 is magnetized, the swing scroll 25 is enabled to make a swing motion by the pressure of the compressed gas, and the fixed scroll 23 and the swing scroll 25 can be assembled with each other as in the case where the rotor 39 is not magnetized. Therefore, the magnetization of the rotor 39 and the centering of the fixed scroll 25 can be performed irrespective of the order of the magnetization of the rotor 39 and the centering of the fixed scroll 25.

Still furthermore, according to the embodiment to which the present invention is applied, the operation of rotating the rotor 39 by a predetermined angle and then stopping the rotor 39, applying the voltage to the stator windings of the driving motor 13, rotating the driving shaft 15 by a predetermined angle and then stopping the driving shaft 15 again, and then applying the voltage again is repeated to magnetize the rotor. Accordingly, even when the winding magnetization of passing current through the stator windings constituting the stator coil 18 of the stator 37 to generate magnetic field in the stator core 37A and magnetize the rotor 39 is performed, after the rotor 39 is magnetized, and the compressed gas which makes the swing scroll 25 swingable by prevailing against the magnetic force caused by the magnetization is injected from the discharge hole 73 into the swing space 12 and made to act on the discharge side of the scroll compression mechanism 11 so as to make the swing scroll 25 swingable, whereby the swing scroll 25 is made to make a swing motion by the pressure of the compressed gas and the fixed scroll is centered.

Still furthermore, according to the embodiment to which the present invention is applied, the rotor 39 is magnetized before assembled to the DC driving motor 13. Accordingly, the rotor 39 is magnetized by using the external magnetization before the rotor 39 is assembled with the DC driving motor 13, the compression gas which prevails against the magnetic force caused by the magnetization to make the swing scroll 25 swingable is injected from the discharge hole 73 into the swing space 12 and made to act on the discharge side of the scroll compression mechanism 11 so as to make the swing scroll 25 swingable so that the swing scroll 25 is made to make a swing motion by the pressure of the compressed gas and the fixed scroll 23 is centered.

Still furthermore, according to the embodiment to which the present invention is applied, in the method of assembling the scroll compression device 1 having the scroll compression mechanism 11 comprising the fixed scroll 23 and the swing scroll 25 to compress refrigerant, and the inverter-controlled DC driving motor 13 which is connected to the scroll compression mechanism 11 through the driving shaft 15 to drive the scroll compression mechanism 11, the scroll compression mechanism 11 and the DC driving motor 13 being accommodated in the casing 3, the scroll compression mechanism 11 is supported in the casing 3 by the main frame 21, the compressed gas is made to act on the discharge side of the scroll compression mechanism 11 from the discharge hole 73 so that the swing scroll 25 makes a swing motion, the fixed scroll 23 is positioned to the main frame 21 after the swing scroll 25 and the fixed scroll 23 are centered, and the operation of rotating the driving shaft 15 by a predetermined angle and then stopping the driving shaft 15, applying the voltage to the windings of the DC driving motor 13, rotating the driving shaft 15 by a predetermined angle and then stopping the driving shaft 15 again, and applying the voltage is repeated to magnetize the rotor. Accordingly, the rotor 39 can be magnetized after the compressed gas is made to act on the discharge side of the scroll compression mechanism 11 so that the swing scroll 25 makes a swing motion, the fixed scroll 23 is centered and the fixed scroll 23 is positioned to the main frame 21. Therefore, when the fixed scroll 23 is centered, the swing motion of the swing scroll 25 can be performed without being affected by the magnetic force of the rotor 39, and the swing scroll 25 is made to swing by the pressure of the compressed gas, whereby the fixed scroll 23 is centered.

Description of Reference Numerals

1 scroll compression device

3 casing

11 scroll compression mechanism

13 driving motor (DC driving motor)

15 driving shaft

21 main frame

23 fixed scroll

25 swing scroll

37 stator

39 rotor

73 discharge hole 

1. A method of assembling a scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, characterized by comprising: supporting the scroll compression mechanism in the casing by a main frame; magnetizing a rotor of the DC motor; making compressed gas act on a discharge side of the scroll compression mechanism so that the swing scroll is made swingable while prevailing against magnetic force caused by the magnetization after the rotor is magnetized, whereby the swing scroll makes a swing motion and the swing scroll and the fixed scroll are centered; and then positioning the fixed scroll to the main frame.
 2. The method of assembling the scroll compression device according to claim 1, wherein the rotor is magnetized by repeating an operation of rotating the driving shaft by a predetermined angle, stopping the driving shaft, applying a voltage to stator windings of the DC motor, rotating the driving shaft by a predetermined angle again, stopping the driving shaft again and then applying the voltage again.
 3. The method of assembling the scroll compression device according to claim 1, wherein the rotor is magnetized before assembled to the DC motor.
 4. A method of assembling a scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, characterized by comprising: supporting the scroll compression mechanism in the casing by a main frame; positioning the fixed scroll to the main frame after compressed gas is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion to center the swing scroll and the fixed scroll; and repeating an operation of rotating the driving shaft by a predetermined angle, stopping the driving shaft, applying a voltage to windings of the DC motor, rotating the driving shaft by a predetermined angle again, stopping the driving shaft again and then applying the voltage again to magnetize the rotor.
 5. A scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, characterized in that the scroll compression mechanism is supported in the casing by a main frame; a rotor of the DC motor is magnetized; after the rotor is magnetized, compressed gas which prevails against magnetic force caused by the magnetization and makes the swing scroll swingable is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion and the swing scroll and the fixed scroll are centered; and then the fixed scroll is positioned to the main frame, whereby the scroll compression mechanism is assembled.
 6. A scroll compression device comprising a scroll compression mechanism having a fixed scroll and a swing scroll to compress refrigerant, and an inverter-controlled DC motor that is connected to the scroll compression mechanism through a driving shaft to drive the scroll compression mechanism, the scroll compression mechanism and the DC motor being accommodated in a casing, characterized in that the the scroll compression mechanism is supported in the casing by a main frame; the fixed scroll is positioned to the main frame after compressed gas is made to act on a discharge side of the scroll compression mechanism so that the swing scroll makes a swing motion to center the swing scroll and the fixed scroll; and an operation of rotating the driving shaft by a predetermined angle, stopping the driving shaft, applying a voltage to windings of the DC motor, rotating the driving shaft by a predetermined angle again, stopping the driving shaft again and then applying the voltage again is repeated to magnetize the rotor, whereby the scroll compression device is assembled. 